Reversible combinatory logic

  • Authors:
  • Alessandra Di Pierro;Chris Hankin;Herbert Wiklicky

  • Affiliations:
  • Dipartimento di Informatica, Universitá di Pisa Largo Bruno Pontecorvo, 3, 56127 Pisa, Italy Email: dipierro@di.unipi.it;Department of Computing, Imperial College London 180 Queen's Gate, London SW7 2AZ, United Kingdom Email: clh@doc.ic.ac.uk, herbert@doc.ic.ac.uk;Department of Computing, Imperial College London 180 Queen's Gate, London SW7 2AZ, United Kingdom Email: clh@doc.ic.ac.uk, herbert@doc.ic.ac.uk

  • Venue:
  • Mathematical Structures in Computer Science
  • Year:
  • 2006

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Abstract

The $\lambda$-calculus is destructive: its main computational mechanism, beta reduction, destroys the redex, which makes replaying the computational steps impossible. Combinatory logic is a variant of the $\lambda$-calculus that maintains irreversibility. Recently, reversible computational models have been studied mainly in the context of quantum computation, as (without measurements) quantum physics is inherently reversible. However, reversibility also fundamentally changes the semantical framework in which classical computation has to be investigated. We describe an implementation of classical combinatory logic in a reversible calculus for which we present an algebraic model based on a generalisation of the notion of a group.